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An Introductory Electric Motors and Generators Experiment for a Sophomore Level Circuits Course

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An Introductory Electric Motors and Generators Experiment for a Sophomore Level Circuits Course AC 2008-310: AN INTRODUCTORY ELECTRIC MOTORS AND GENERATORS EXPERIMENT FOR A SOPHOMORE-LEVEL CIRCUITS COURSE Thomas Schubert, University of San Diego Thomas F. Schubert, Jr. received his B.S., M.S., and Ph.D. degrees in electrical engineering from the University of California, Irvine, Irvine CA in 1968, 1969 and 1972 respectively. He is currently a Professor of electrical engineering at the University of San Diego, San Diego, CA and came there as a founding member of the engineering faculty in 1987. He previously served on the electrical engineering faculty at the University of Portland, Portland OR and Portland State University, Portland OR and on the engineering staff at Hughes Aircraft Company, Los Angeles, CA. Prof. Schubert is a member of IEEE and ASEE and is a registered professional engineer in Oregon. He currently serves as the faculty advisor for the Kappa Eta chapter of Eta Kappa Nu at the University of San Diego. Frank Jacobitz, University of San Diego Frank G. Jacobitz was born in Göttingen, Germany in 1968. He received his Diploma in physics from the Georg-August Universität, Göttingen, Germany in 1993, as well as M.S. and Ph.D. degrees in mechanical engineering from the University of California, San Diego, La Jolla, CA in 1995 and 1998, respectively. He is currently an Associate Professor of mechanical engineering at the University of San Diego, San Diego, CA since 2003. From 1998 to 2003, he was an Assistant Professor of mechanical engineering at the University of California, Riverside, Riverside, CA. He has also been a visitor with the Centre National de la Recherche Scientifique at the Université de Provence (Aix-Marseille I), France. His research interests include direct numerical simulations of turbulent flows with shear, rotation, and stratification, as well as bio-fluid mechanical problems at the micro-scale. Prof. Jacobitz is a member of the American Society of Mechanical Engineers (ASME), the American Association for the Advancement of Science (AAAS), the American Physical Society (APS), the American Geophysical Union (AGU), and the Deutsche Physikalische Gesellschaft (DPG). He currently serves as the faculty advisor to the student section of the ASME at the University of San Diego and on the council of the Pacific Division of the AAAS. Ernest Kim, University of San Diego Ernest M. Kim received his B.S.E.E. from the University of Hawaii at Manoa in Honolulu, Hawaii in 1977, an M.S.E.E. in 1980 and Ph.D. in Electrical Engineering in 1987 from New Mexico State University in Las Cruces, New Mexico. His dissertation was on precision near-field exit radiation measurements from optical fibers. He worked as an Electrical Engineer for the University of Hawaii at the Naval Ocean Systems Center, Hawaii Labs at Kaneohe Marine Corps Air Station after graduating with his B.S.E.E. Upon completing his M.S.E.E., he was an electrical engineer with the National Bureau of Standards in Boulder, Colorado designing hardware for precision fiber optic measurements. He then entered the commercial sector as a staff engineer with Burroughs Corporation in San Diego, California developing fiber optic LAN systems. He left Burroughs for Tacan/IPITEK Corporation as Manager of Electro-Optic Systems developing fiber optic CATV hardware and systems. In 1990 he joined the faculty of the University of San Diego. He remains an active consultant in radio frequency and analog circuit design, and teaches review coursed for the engineering Fundamentals Examination. Dr. Kim is a member of the IEEE, ASEE, and CSPE. He is a licensed professional electrical engineer in California. Page 13.192.1 Page © American Society for Engineering Education, 2008 An Introductory Electric Motors and Generators Experiment for a Sophomore-Level Circuits Course Abstract The design, implementation, and assessment of an introductory electric motors and generators experiment in sophomore-level electric circuits courses are described. Two separate courses were enhanced by the addition of a common motors experiment for both students in the electrical engineering program (e.g., as student preparation for an electric power class) and those in other engineering majors (e.g., as student preparation for mechanical engineering lab experiences). The experiential foundation in the motors lab was designed to solidify concepts on efficiency of energy conversion and on motor performance. Topics included modeling of electric motors, predicting motor performance, and experimentally obtaining relevant motor constants. The experiment used a simple sub-fractional horsepower (Fischertechnik #32293: ~1.5 Watt) electric motor together with a unique small-scale dynamometer. In the experiment, students were required to experimentally determine the rotational speed of a motor using an optoswitch- based tachometer to find the motor voltage constant, kE; to determine motor torque constant, kT; to explore the use of a dynamometer to measure the conversion of electrical energy into mechanical energy; and to investigate the use of a motor as a generator. Despite the low-cost equipment, experimental results proved to be reliable, accurate, and repeatable. For example, the motor kE – kT match was typically found to be within 5%. Student learning was assessed through questionnaires at the beginning and end of the laboratory period. The questionnaires addressed both student knowledge and student confidence levels. The assessment showed a significant overall increase of both student knowledge and confidence scores as well as significant incremental increases. The data also showed that each incremental increase could approximately be represented as a normal distribution. Detailed analysis of the assessment data revealed strengths in student preparation for the experiment as well as certain course topics, such as the operating principles of a dynamometer, which will require more in-depth coverage in subsequent offerings of the course. I. Introduction Responding to a recent resurgence in interest concerning basic electric machines and their control 1 has been a challenge for many electrical engineering programs that, either through retirement of elderly equipment or the failure to acquire equipment, have been caught without proper resources for laboratory exploration of electric machines, in particular in introductory electrical circuits courses. The University of San Diego (USD) falls into the latter category with an electrical engineering (EE) curriculum focused on the electronics and communications industries rather than on electrical machines. Recent additions of a mechanical engineering (ME) program and an industrial & systems engineering program to the existing electrical engineering (EE) program have altered the student population balance and, necessarily, have shifted the focus of many lower division courses. In response to these changes, the one- semester, sophomore-level electric circuits curriculum was changed. Prior to the change, all 13.192.2 Page engineering students enrolled in a single course designed primarily to meet the needs of EE students. After the change, a second course was added with a more diversified content to meet the needs of other engineering majors. The first course continued to focus entirely on electric circuits. The basics of electronics and electric motors became the major focus for the last 40% of the new second course with electric machines occupying, at most, the last six lectures and a single lab period. While laboratory experiments covering electronics are easily adapted from the EE electronics core, neither experiments covering the basics of electric motors nor any appropriate equipment existed at USD. The upper division curriculum of EE at USD does include a course, Principles of Electric Power, that has a large component covering electric machines, but this course does not have an associated laboratory or significant demonstration equipment. The ME program does have a few instrumentation laboratory exercises using the National Instruments ELVIS system including one concerning DC motor speed 2, but those exercises are limited to a very few lab stations. A faculty team was formed to create a single motor experiment that could easily and simultaneously be performed by approximately twenty students working in groups of two or three within a single three-hour laboratory period. In order to cover a wide diversity of concepts, the often-used approach of building a simple DC motor, such as the construction of Beakman’s motor 3, was eliminated in favor of an approach based more on the testing and modeling of an existing DC machine. This approach allows the introduction of mechanical concepts such as force, torque, and power, in the treatment of an electrical system. Among the reasons for choosing a DC motor over an AC motor are: the operating principles governing the control of a DC motor are significantly simpler than those for an AC motor and therefore more suitable for a sophomore-level course, there are a large number of DC motors currently in use and their absolute number keeps increasing, and the control of an AC motor drive emulates the operating principles of a DC motor and its drive 4. The team’s working budget was US$200 to outfit ten (10) lab stations. Such a small budget immediately eliminated the possibility of purchasing a significant number of fractional- horsepower (~150W) motors. Since the department had previously purchased a large number of Fischertechnik motors for another project 5, these subfractional-horsepower (~1.5W) motors were chosen
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